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Jun W, Hu R, Hyland L, Crandall D, Ramachandran P, Pangarkar C, Sivaraman S, Haghiri B. Expression and characterization of the soluble form of recombinant mature HSV-2 glycoprotein G for use in anti-HSV-2 IgG serodiagnostic immunoassay. J Virol Methods 2017; 252:65-69. [PMID: 29104048 DOI: 10.1016/j.jviromet.2017.10.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 10/23/2017] [Accepted: 10/25/2017] [Indexed: 11/17/2022]
Abstract
Herpes simplex virus type-2 (HSV-2) specific glycoprotein G (gG-2) is widely used as the antigen of choice for serodiagnosis of HSV-2. In order to develop an ELISA for serodetection of HSV-2 IgG in patient sera, the soluble form of the mature gG-2 antigen (mgG-2), gG283-649, was expressed using a baculovirus expression system. gG283-649 contains the complete extracellular domain of mgG-2 including the C-terminal region, which despite homology to gG-1, does not cross-react with HSV-1 antibodies present in HSV-1 positive patient sera. gG283-649 had increased performance compared to a previously described gG-2 fragment and showed high sensitivity and specificity in a method comparison with HerpeSelect 1 & 2 Immunoblot IgG, a commercially available FDA-cleared assay for serodetection of HSV-1 and 2 antibodies. A total of 234 clinical samples consisting of 134 high risk samples, including 45 samples from pregnant subjects, and a panel of 100 mixed diagnosis samples, spanning the measurable range were tested in the method comparison. Clinical sensitivity and specificity were determined to be 94.2% and 100%, respectively. We conclude that this soluble form of mgG-2 is a novel antigen of choice for developing an ELISA for type-specific serodiagnosis of HSV-2.
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Affiliation(s)
- Wesley Jun
- Theranos, Inc., 1701 Page Mill Road, Palo Alto, CA, 94304, USA.
| | - Ran Hu
- Theranos, Inc., 1701 Page Mill Road, Palo Alto, CA, 94304, USA.
| | - Laura Hyland
- Theranos, Inc., 1701 Page Mill Road, Palo Alto, CA, 94304, USA.
| | - Darren Crandall
- Theranos, Inc., 1701 Page Mill Road, Palo Alto, CA, 94304, USA.
| | | | | | | | - Babak Haghiri
- Theranos, Inc., 1701 Page Mill Road, Palo Alto, CA, 94304, USA.
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